Swift. Convert any object to dictionary

DictionaryConvertible.swift

protocol DictionaryConvertible: Codable {
    func convertToDictionary() -> [String: Any]
}

extension DictionaryConvertible {
    func convertToDictionary() -> [String: Any] {
        let jsonEncoder = JSONEncoder()
        let jsonData = try! jsonEncoder.encode(self)
        do {
            return try (JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any])!
        } catch {
            print(error.localizedDescription)
            return [:]
        }
    }
}

Then you only need to inherit your structure from DictionaryConvertible protocol and call method convertToDictionary() on your object.

In return you should get [String: Any] dictionary.

Better to directly extend the Encodable protocol, so that any thing conform to Encodable and the Codable protocol able to get access to that method. No need to add a new protocol.

extension Encodable {
    func convertToDictionary() throws -> [String: Any] {
        let data = try JSONEncoder().encode(self)
        guard let dictionary = try JSONSerialization.jsonObject(with: data, options: .fragmentsAllowed) as? [String: Any] else {
          throw NSError()
        }
        return dictionary
    }
}